Map-drawing machine



May l, 1923.

H. C. CAMPBELL MAP DRAWING MACHINE Filed March 2. 1921 2 Sheets-Sheet l INvENToR Henr Cfamfben #Mn-zw May 1, 1923. 1,453,377

H. C. CAMPBELL MAP DRAWING MACHINE Filed March 2. 1921 2 Sheets-Sheet 2 fa Je Invehior Henry ClCampbell Patented M ay 1,1923.'4 i

HENRY covERLEY CAMPBELL, or Naw Yonx, N. Y.

MAP-DRAWING MACHINE.

Application mea March 2, 192i. serial No. 450,166.l

' y To all 'whom it may concern.'

Be it known that` I, HENRY CovERLnY CAMPBELL. of the'city ofA New York, in the county of New YorkState of New York, United Staates of America, have invented certain new and useful Improvements lin Map-Drawing Machines` of which Ithe followingis the specification.

My invention relates -to improvements in map drawing machines and theobject ofthe invention is to devise a machine which may be connected to the driving and steering gear of a vehicle and which will automatically trace a scalemap of the route of such vehicle upon a suitable reproducing surface audit consists essentially of t-he following arrangement and costruction of, parts as hereinafter more particularly explained.

Figure 1 is a general perspective view of my device showing the exterior casing broken away.

Figure 2 is a cross sectional view on line ,ay, AFigure 3. l

Figure 3 is a longitudinal sectional view through the central portionof my device and indicating diagrammatically the connections between the device and the steering wheel and the drive shaft of a vehicle.

Fi ure 4 is a detail perspective view of the supp emental adjusting gears and a portion of the supporting shaft thereof.

In the drawings like letters ofD reference indicate corresponding parts in the various gures. I, i

1 indicates a casing, the walls of which l may be transparent if so desired. 2 indicates a rectangular frame secured to the bottomofthe casing. 3 indicates a shaft journalled in the upper and lower members 2X and 21 of the frame 2. v 4 indicates a frame comprising a base board 41 secured to the shaft 3, the standards 42 and 43 extending upwardly from the'base board .connected together intermediately of their height by a cross piece 4"L in which the upper end of the shaft 3 is secured. 45 indicates a top board carried by the upper ends of the vstiandards 42 and 41. The top board 45 is provided with slots 46V and 4T for a purpose which will hereinafter appear. i

5 indicates a cross shaft journalled in the standards 42 and 43 immediately above the crosspiece 44. The shaft 5 projects beyond the standards 42 andk 43 and 6 and 7 indicate friction gears carried by the projecting ends of theshaft 5 the upper peripheral portions of which project throu h the slots 4 and 41 as clearly indicated in igure 1, of the drawings.

8 and 9 indicate supplemental shafts extending attheir lower ends through arcsliaped slots 10, which are concentric with the centre of the vertical shaft '3. 'The shafts 8 and 9 are journalled at their lower' ends in the base board 4.1 and at their upper ends in the top board 45. Each shaft 8 and 9 is. provided with a spiral portion 1 1 (see F ig. 4). 12and 13 indicate friction pinions, the hubs ofwhich are provided with an inwardly extending projection 14 extending into the spiral groove 11.

15 indicates a frame which surrounds each of the gears 12 and 13 and is provided with vertically aligned orifices 15X and 151 through which the shafts 8 and 9 freely extend. .Each frame 15 is provided'with upwardly extending lugs 16. 17 and 18 indicate rods extending between the base board 41 and top board 45, 17 and 18x indicate sleeves secured to the rods 17 and 18, from each of which extends a lug 171.- To each lug 171 is pivoted a lever arm 19 provided with a slotted enlargement 20 through whichT the shaft 8 or 9 extends.

21 indicate links 'connecting the side 'portions of the slotted'enlargement 20 with the lugs 16. r1`he free end of the lever arm 19 'PATENT lorrillicit-i.` i

is provided with a downward extension 19x carrying a cam roller 191 at its lower end.

22 indicates a cam way, which is semicircu lar/,in plan and gradually rises up towards the centre of the machinehaving its highest point at 22X. Normally the cam rollers'191 bear upon the cam way 22 at each side'thereof and at an intermediate point.

23 indicates a bracket, which is secured to the bottom of the casingv and in which is journalled a shaft 24, which is suitably geared to the steering shaft 24 of the automobile by means of the gear 242 which engages a gear' 243 carried by the steering shaft 241. 244 is the steering wheel. 25 in-y dicates a pulley journalled at the upperend of the shaft 24. 26 indicates a pulley mounted on a shaft 27 journalled in the top board 2X of the casing 2. 28 indicates a pulley mounted upon the upper end ofthe shaft. 27 and 29 indicates a cord connecting the pulleys 25 and 26. 30 indicates a pulley `secured tothe shaft 3 and 31 indicates a cord machine.

connecting the pulley 28 with the pulley 30. By this means it will be seen that whenever the steering shaft 241 is turned the shaft 3 and frame 4 carried thereby are turned in a ,corresponding direction.

32 indicates a drawing board, which rests normally in proximity to one edge thereof upon the u per peripheral portions of the gears 6 an 7 projecting through the slots 4y and 4". The drawing board is designed to carry paper on which the route map is designedreto be traced. 33 indicates a casting provided with a hollow stem 34, the orifice 'of which extends down through the bottom of the casting. The ends of the casting 33 are rovided with bearing lugs 35 provided wit a stud shaft 36 on which are journaled wheels 37,-which bear upon the upper face of the drawing board. 39 indicates a pulley provided with a cupped upper end 39x bearing against the point bearing 40 carried by Ithe frame. 41 lndicates a stem extending downwardly dfrom the pulle 39 and fitting within ythe hollow stem 34. he stem 34 is provided with a vertical slot 34x and 41x indicates a feather key extendin from the,stem 41 into the slot 34*. 42 in icates a compression spring which extends between the top of the casing 33 and the lower'face of the pulley 39. 43 indicates a pencil, which is held in a vertical position in the hollow stem- -34, the point of which bears upon the board 32 in vertical alignment with the centre ofthe shaft 3. 44 indicates a ball bearing supporting the free end of the board in its normal po-l sition. 45 indicates a pulley secured to the lower end of the shaft 8. 46 indicates a pulley secured to the lower end of the shaft 9. 48 and 49 indicate pulleys mounted on the lower end of the shaft 3. 48* indicates a cord connecting the pulleys 48 with the pulle 46 and 49x indicates a cord connectmg It e pulley 49 with the pulley 45.

50 indicates a weighted rocking lever provided with a jawed end 51 in which is journaled a4 ulle 52. 53 indicates a pulley also mounte an secured to the pulleys 48 and 49 to the shaft 3. 54 indicates a cord connecting the pulley 53 with the pulley 52. 55 indicates a drum, the periphery of which is concave and concentric to the centre of swing of the weighted lever 50. The drum 55 is mounted upon a shaft 56 journalled in a bracket 57 secured to the casing of the The lower end of the shaft 56 extends through the bottom of the casing and has secured thereto a ulle 58 which is connected by any suita le riving mechanism to the driving gear of the automobile. For instance by the cord 581 which engages a pulley 582 carried on the driving shaft 58 of the automobile. 60 indicates a su plemental vertical shaft journalled in suitable bearingsl `forming partof the main casley 63 with the pulley 39. -By this means it will be seen that when the frame 4 is turned by means of the steering gear as above described, the wheels 37 will also be turned in a corresponding direction by'means of the pulley drive 62, 61, shaft 60,'pulley 63 and,V

cord 64 to the pulley 39.

As will be understood the drum 55 having the convex periphery will be driven contiuuously from the driving gear 58z of the automobile or other vehicle when such vehicle is running and that, therefore, the pulley 52 will be driven therefrom and that shafts 8 and 9 rotated from the pulley, 52 by means of the cord 54 mounted upon the pulley 53 on the shaft 3, and pulleys 48 and 49 connected thereto and from -then throughthe cords 48x and 49x to the pulleys 45 and 46 carried by the shafts 8 and 9. The friction pinions 12 and 13 being mounted upon the shafts 8 and 9 in contact/with the ars 6 and 7 rotate such gears gradually fee ing the drawin board 32 forward. As the drawing boar 32 is fed forward the pencil 43 makes a straight track upon the board. i

In order to trace curves in the route the following operation takes place. Y

When the steering shaft 241 is turned the shaft n3 and frame 4 carried thereon is also turned and with it is carried the lever arms 19 carrying the cam rollers 191. As the frame 4 is turned one cam roller mounts up the cam way towards the high point 22* and the other cam roller descends away from such high point thereby raising one lever arm19 and depressing the other. operation one frame 15 is drawn upward and the other frame 15 drawn downward thereby forcing the friction pinions 12 and 13 in a corresponding direction, the s iral grooves in the shafts 8 and 9 allowing or this move ment.

It will thus be seen that the drive between one pinion 12 or 13 and its corresponding By such y friction gear 6 or 7 is increased and the y corresponding'drive at the opposite side of the machine decreased and that, therefore, as the drive from the driving ar of the automobile continues through t e drum 55 to the friction gears 6 and 7 one side of the board 32 is carried forward more rapidly tinue to track a straight line swinging the lever 50 carrying the pulley 52 into engagement with the concave drum 55,.alloWing for the increase or decrease in drive necessary when going up or down a hill.

From this description it will be seen that I have devised a very simple device whereby a route map may be automatically drawn by a suitable reproducing instrument, which will be an accurate scale map of the route passed over by the Vehicle in which such desaid pinions radially of the gears in opposite directions operated from the steering mechanism of the vehicle.

2. In a map drawing machine, the combination with the driving gear and steering gear of an automobile, of a pair of suitably mounted vertically set gears, a drawing board resiliently held in contact with the peripheries of said gears, a pencil point resiliently held against the board, a friction pinion held in engagement with the face of each of said gears, a supporting shaft for each of said pinions having'a spiral groove therein, a projection extending from the pinions and engaging the spiral groove, a frame surrounding each of said pinions, an inclined face cam located at each side of the mechanism, a pivoted lever connected to each of the frames surrounding each pinion, and a cam lever carried by each lever in engagement with the corresponding face cam.

HENRY COVERLEY CAMPBELL. 

